New research reports a high prevalence of vitamin D insufficiency and deficiency among patients with psoriatic arthritis. Seasonal variation in vitamin D levels was not observed in patients in southern or northern locations. The findings published in Arthritis Care & Research, a journal of the American College of Rheumatology (ACR), also show no association between disease activity and vitamin D level. Psoriasis is a common chronic skin disorder, likely caused by an autoimmune response, and is characterized by red scaly patches on the surface of the skin... 
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